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Finding the Fourth Proportional to 386,412.10, 578,840.55 and 260,440.90

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Solution

The fourth proportional to 386,412.10, 578,840.55 and 260,440.90 is: 390,137.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,412.10 : 578,840.55 = 260,440.90 : x
  2. Step 2: Convert to fraction form
    386,412.10/578,840.55 = 260,440.90/x
  3. Step 3: Cross multiply
    386,412.10x = 578,840.55 × 260,440.90
  4. Step 4: Simplify right side
    386,412.10x = 150,753,753,798.50
  5. Step 5: Solve for x
    x = 150,753,753,798.50/386,412.10
  6. Step 6: Final answer
    x = 390,137.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.